The effects of spark plasma sintering consolidation on the ferromagnetic resonance spectra (FMR) of Ni–Zn ferrites

Authors

  • R. Ortega-Zempoalteca,

    1. Departmento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F., México
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  • Y. Flores-Arias,

    1. Departmento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F., México
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  • G. Vázquez-Victorio,

    1. Departmento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F., México
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  • T. Gaudisson,

    1. Laboratoire ITODYS, Université Paris-Diderot, Paris cedex, France
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  • S. Ammar,

    1. Laboratoire ITODYS, Université Paris-Diderot, Paris cedex, France
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  • Z. Vargas-Osorio,

    1. Departmento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F., México
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  • U. Acevedo-Salas,

    1. Departmento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F., México
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  • R. Valenzuela

    Corresponding author
    1. Departmento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F., México
    • Corresponding author: e-mail raulvale@yahoo.com, Phone: +52 55 5622 4653, Fax: +52 55 5616 1371

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Abstract

Magnetic nanoparticles (NPs) of magnetite and Ni–Zn ferrites, synthesized by the forced hydrolysis in a polyol method, were used as the starting material to consolidate them by means of the spark plasma sintering (SPS) method. The microstructural changes were analyzed by X-ray diffraction, transmission electron microscopy (TEM), magnetic hysteresis loops, and ferromagnetic resonance (FMR) measurements. FMR spectra changed from a high resonance field and small linewidth for the nanoparticles to a spectrum with reduced resonance field with extremely broadened linewidths for the consolidated materials. These effects can be ascribed to the evolution from superparamagnetic NPs to the formation of a nanostructured ceramic structure with high grain-to-grain interactions and with increased randomly distributed anisotropy axes.

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